Attribute name	Options	Default
immutable	true|false	true for set, map, false otherwise
Tag name		File
orion-ejb-jar/enterprise-beans/entity-deployment/cmp-field-mapping/map-mapping/value-mapping		orion-ejb.jar.xml

Whether or not the value can be trusted to be immutable once added to the Collection/Map. Setting this to true will optimize database operations extensively. The default value is "true" for set-mapping and map-mappings and "false" for collection-mapping and list-mapping.